Một chất điểm chuyển động trên đường tròn bán kính 5m từ trạng thái đứng yên, nhanh dần đều với gia tốc góc bằng 2 rad/s2. Sau 20 giây vật có vận tốc m/s và gia tốc hướng tâm m/s2

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?

In automobile steering wheel is shown what is the ideal mechanical advantage blank? if the ama is eight what is the efficiency of the steering wheel?

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up